1 //===-- MBlazeISelLowering.h - MBlaze DAG Lowering Interface ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that MBlaze uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef MBlazeISELLOWERING_H
16 #define MBlazeISELLOWERING_H
19 #include "MBlazeSubtarget.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Target/TargetLowering.h"
36 inline static CC getOppositeCondition(CC cc) {
38 default: llvm_unreachable("Unknown condition code");
48 inline static const char *MBlazeCCToString(CC cc) {
50 default: llvm_unreachable("Unknown condition code");
63 // Start the numbering from where ISD NodeType finishes.
64 FIRST_NUMBER = ISD::BUILTIN_OP_END,
66 // Jump and link (call)
69 // Handle gp_rel (small data/bss sections) relocation.
72 // Select CC Pseudo Instruction
75 // Wrap up multiple types of instructions
81 // Return from subroutine
84 // Return from interrupt
89 //===--------------------------------------------------------------------===//
90 // TargetLowering Implementation
91 //===--------------------------------------------------------------------===//
93 class MBlazeTargetLowering : public TargetLowering {
95 explicit MBlazeTargetLowering(MBlazeTargetMachine &TM);
97 /// LowerOperation - Provide custom lowering hooks for some operations.
98 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
100 /// getTargetNodeName - This method returns the name of a target specific
102 virtual const char *getTargetNodeName(unsigned Opcode) const;
104 /// getSetCCResultType - get the ISD::SETCC result ValueType
105 EVT getSetCCResultType(EVT VT) const;
109 const MBlazeSubtarget *Subtarget;
112 // Lower Operand helpers
113 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
114 CallingConv::ID CallConv, bool isVarArg,
115 const SmallVectorImpl<ISD::InputArg> &Ins,
116 DebugLoc dl, SelectionDAG &DAG,
117 SmallVectorImpl<SDValue> &InVals) const;
119 // Lower Operand specifics
120 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
121 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
122 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
123 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
124 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
125 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
128 LowerFormalArguments(SDValue Chain,
129 CallingConv::ID CallConv, bool isVarArg,
130 const SmallVectorImpl<ISD::InputArg> &Ins,
131 DebugLoc dl, SelectionDAG &DAG,
132 SmallVectorImpl<SDValue> &InVals) const;
135 LowerCall(TargetLowering::CallLoweringInfo &CLI,
136 SmallVectorImpl<SDValue> &InVals) const;
139 LowerReturn(SDValue Chain,
140 CallingConv::ID CallConv, bool isVarArg,
141 const SmallVectorImpl<ISD::OutputArg> &Outs,
142 const SmallVectorImpl<SDValue> &OutVals,
143 DebugLoc dl, SelectionDAG &DAG) const;
145 virtual MachineBasicBlock*
146 EmitCustomShift(MachineInstr *MI, MachineBasicBlock *MBB) const;
148 virtual MachineBasicBlock*
149 EmitCustomSelect(MachineInstr *MI, MachineBasicBlock *MBB) const;
151 virtual MachineBasicBlock*
152 EmitCustomAtomic(MachineInstr *MI, MachineBasicBlock *MBB) const;
154 virtual MachineBasicBlock *
155 EmitInstrWithCustomInserter(MachineInstr *MI,
156 MachineBasicBlock *MBB) const;
158 // Inline asm support
159 ConstraintType getConstraintType(const std::string &Constraint) const;
161 /// Examine constraint string and operand type and determine a weight value.
162 /// The operand object must already have been set up with the operand type.
163 ConstraintWeight getSingleConstraintMatchWeight(
164 AsmOperandInfo &info, const char *constraint) const;
166 std::pair<unsigned, const TargetRegisterClass*>
167 getRegForInlineAsmConstraint(const std::string &Constraint,
170 virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
172 /// isFPImmLegal - Returns true if the target can instruction select the
173 /// specified FP immediate natively. If false, the legalizer will
174 /// materialize the FP immediate as a load from a constant pool.
175 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
179 #endif // MBlazeISELLOWERING_H